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Avalanche Forecast

Archived

Mar 1st, 2022–Mar 2nd, 2022

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.

Regions

Yukon.

Storm snow is not bonding well to old firm surfaces below it. As a result, a natural avalanche cycle occurred on Tuesday. This problem increases with greater snow depths at higher elevations. Conservative terrain will be prudent until the new snow has had more time to bond. 

Confidence

Moderate - Confidence is due to a stable weather pattern with little change expected.

Weather Forecast

Tuesday Night: Mostly cloudy. Snow flurries possible. Winds light and variable. Temperature -9°C.

Wednesday: Mostly cloudy. Flurries later in the afternoon but no significant accumulation of new snow. Winds light and variable. A high of -3°C and a low of -6°C

Thursday: A mix of sun and cloud. No new snow. Winds moderate from the south. A high of -4°C and a low of -10°C. 

Friday: A mix of sun and cloud. No new snow. Light winds from the southwest. A low of -12°C and a high of -6°C

Avalanche Summary

On Tuesday afternoon, our field team reported a widespread natural avalanche cycle to size 2 in the alpine areas beyond Fraser (Bryant) Lake

Further south towards the U.S.A side of White Pass, there was reports of up to 20cm of new snow that had formed sensitive wind slabs that released naturally above the highway and with explosives control to size 2. 

Snowpack Summary

15-30cm of unconsolidated storm snow now sits on top of firm surfaces in White Pass. As of Tuesday afternoon, this storm snow had settled enough to produce a widespread natural avalanche cycle to size 2 as reported by our field team. The avalanches were running on firm, wind hammered surfaces. 

The middle snowpack is firm, well settled, and bonded and is effectively bridging the weak, sugary crystals that exists at the bottom of the snowpack. 

Areas north of the White Pass such as Paddy Peak, Tutshi, and Powder Valley continue to host a wind smashed and scoured landscape. 

Terrain and Travel

  • Use increased caution at all elevations. Storm snow is forming touchy slabs.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Don't be too cavalier with decision making, storm slabs may remain sensitive to human triggering.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.